Apparatus for mixing gas and air.



No. 896,519. I PATBNTBD AUG. 18, 1908.

E. DANKBLMANN. APPARATUS FR MIXING GAS AND AIR.

APPLICATION FILED SEPT. 17, 1904.

ERICH DANKELMANN, OF BERLIN,

GERMANY, ASSIGNOR T0 THE FIRM OF SELAS GESELL- SCHAFT MIT BESCHRNKTERHAFTUNG, OF BERLIN, GERMANY.

APPARATUS FOR MIXING GAS AND AIR.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed September 17, 1904. Serial No. 224,863.

To all whom t may concern:

Be it known that I, Enron DANKELMANN, a subject of the Emperor ofGermany, residing at Berlin, in the Empire of Germany, 6 HellgolfnderUfer, manager, have'invented certain new and useful Im rovements 'inApparatus for Mixing Gas anil Air, of which the following is aspecication.

In admixing gas and air for general use, and more particularly forilluminating purposes, I iind it desirable in employing separate suctionand forcing dam ers for the gas and air respectively to ma e provisionagainst excessive pressure in the service pipe for causing the low ofthe admixture through a circulation conduit, and in doing this I seek toremedy evils which might arise from the fluctuations in the pressure. Inemploying back suction or return conduits their eiliciency may beincreased by providingthem with special suction valves in such mannerthat upon each stroke of the suction ap aratus two inlets for gasor airon the one and and for an adniixture of gas and air on the other handare opened, but are closed during the forcing operation'.

A constructional form of apparatus for carrying this invent-ion intopractice is illustrated in the accompanying drawings, in which Figure 1is a central cross section, partly in elevation, of the apparatusshowing the localtion of the various non-return valves and partsassociated therewith; Fig. 2 shows the apparatus in side elevation; Flg.3 is a plan view showing the pump, valve chambers, and various conduits.

A suction and force pum a is provided which supplies air on one si e ofthe piston and gas on the other side. In accordance with Fig. 2 thesuction of the gas takes place through the through the valve chamber d.The-gas iows through the conduit y, while the air 1s sucked through theconduit The valve chambers c and d are arranged symmetrically. Furtherconstructional details of the valve chambers are shown in Fig. 1, inwhich the o, valve chamber c is representedin section. In this :ligurealso is il ustrated the construction of one of the two valve chambers eand f through which gas and air and also the mixture of as and air whichis sucked back are supplie to the service pipe g. The service pipe g isin communication with the cylinder the pressure in the work chamber.valve chamber c and the air 7c by means of the conduit l, and the valvei for the assage of the gas, which is mounted in the Jack suctionconduit h, is positively connected with the governor.

Concentric with the cylinder 7c and located within it is a smallercylinder 7c. Both of these cylinders are rigidly connected with a capk3, the inner cylinder being also 1n communication with the conduit Z. Afloating member k2 is provided with a cylindrical lower en d which isloosely interposed between the cylinders 7c and 7c so that when a smallquantity of mercury is placed intermediate of the cylinders k andk, theiioating member by resting upon the mercury not only forms a seal butfloats thereupon, so that pressure of the admixture of air andv gases,acting through the conduit l increases and decreases the buoyancy of thecording to the pressure within the conduit l. The result is that theslide valve fi, which normally closes the regulation conduit h maintainsthe same partially open or altogether o en, according to the degree ofressure in t e service ipe g through the con uit l upon the iloat. n theexam le here illustrated, two conduits h and h2 Y back suction conduit7L behind the flow regulator i (Fig. 2), one of these leading to the gassuction valve c and the other to the air suction valve d. v

As shownrin Fig. `1, the same obturating member o serves both .forobturating the gas supply pipe and also for obturating the back suctionconduit h. Accordingly at each suction operation by the lift of theobturating member 0 both the gas suction conduit and the back suctionconduit are simultaneously opened, and vice versa during the supply orforcing phase they are maintained closed In this arra ement the backsuction conduits act only uring the Asuction eriod, and not during theforcing period a so, whereby the advantages previously mentioned areobtained. The valve o is also a non-return valve and reventsretrogression of either air or gas rom the service pipe. i

lhe o eration of my device is as follows: Whent e pump a is actuated airand gas pass in through the respective suction conduits, y, and arecarried into the ypump and thence forced outwardly into the service pipeor main g. The float contained in the receptacle 7c is buoyed by anexcess of theadmixfloating member k3 ac-- ranch ol from theI ture of gasand air passing through the oonduit Z, and in rising lifts thevalve i soas to partiall o The va ve i remains partially o en and allows a limitedquantity of the admixture to pass through the circulation conduit h, theextent of the opening of the valves being inversely proportional to theamount of gas being used from the service ipe g. That is to say, if alittle or no gas is being used from the service pipe, the valve'firemains constantly open to its fullest capacity, and if one-half of thegas passing into the service .mam g is used the valve i remains one-half4 Open, whereas if all of the gas passing in the service main gis usedas fast as supplied, the valve i remains closed.

What I claim and desire to secure Letters Patent of the United yStatesis:

In` an apparatus of the character described, the combination of a u mpchamber, a piston movably mounted) therein, an inlet dis osed at one endof said pump chamber, anfcommunicatinglwith a gas supply, an inlet dieosed at the other end of sald pump cham er and opening directly into theatmosphere, an outlet pipe connected with said pump chamber, acirculation conduit pen the circulation conduit h.k

seams connected with said outlet pipe and branching into two separatepipes, one communicating with said pumfp chamber at a point adj acent tosaid inlet or admitting-air, the other being connected to said pumpchamber at a point adj acent to said inlet for admitting gas, a valvedisposed between said pump chamber and the inlet for admitting gas, saidvalve being controllable by gas pressure for the purpose of opening intosaid pump chamber, another valve dis osed intermediate said pump chamberand) said inlet for admitting air, said last-mentioned valve beingcontrollable by air pressure for the purpose of opening into sald umpchambereach of said valves being c osable by back pressure yfrom saidpump chamber, and means con- 45 trollable automatically by ressure fromsaid outlet pipe for regulating tEe carrying capacity of saldcirculation conduit.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses this 26th day of August, 1904.

ERICH DANKELMANN.

Witnesses HENRY HAsPER, WOLDEMAR HAUPT.

